陽子リレーは,水分子とスクワリック酸誘導体からなる一次元水素結合連鎖で構成されています

H Terao¹, T Sugawara, Y Kita

¹Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo 153-8902, Japan.

Journal of the American Chemical Society

|October 25, 2001

まとめ

この研究は,ビスクワリルビフェニル四水素 (BSQB*4H2O) の結晶における陽子の移動を明らかにした. 水のクラスター内の陽子リレー機構は,水素結合鎖に沿ってソリトンの移動を促進します.

科学分野:

クリスタル・エンジニアリング (Crystal Engineering) とは
超分子化学超分子化学
マテリアルサイエンス材料科学

背景:

ビス・スクワリル・ビフェニル (BSQB) は,機能的な水素結合ネットワークを作成する可能性がある分子です.
水素化された結晶は,陽子の動力学と分子相互作用を研究するためのユニークな環境を提供します.

研究の目的:

水素化ビスクワリルビフェニル (BSQB*4H2O) の結晶構造とダイナミクスを特徴づける.
一次元の水素結合鎖内の陽子輸送のメカニズムを調査する.
構造的特徴と観察された介電特性とを相関させるため.

主な方法:

結晶構造と分子配置を決定するX線結晶学分析.
固体マジック・アングルスピニングデュテリウムNMRスペクトロスコーピーは,デュテロンの交換と移動を調査する.
ダイナミックなプロセスと周波数依存の許容性を分析するためのAC介電測定.

主要な成果:

BSQBはダイアニオンとして存在し,BSQB*4H2O.Oの水分子の部分プロトネーションがある.
BSQB*4D2Oで約250 Kで観測されたデュートロン交換と移動は,陽子の移動性を示しています.
陽子リレーとソリトン移動に関連して,250K以上の介電性電流の有意な増加.

結論:

水のクラスターとBSQBダイアニオンを含むプロトンリレー機構は,電荷輸送を容易にする.
充電ドメインの境界の単独移動は,一次元の水素結合連鎖に沿って発生します.
この研究は,水素化された有機結晶における陽子輸送のための新しいメカニズムを明らかにしています.

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